Nongeometric conditional phase shift via adiabatic evolution of dark eigenstates: a new approach to quantum computation.
Nongeometric conditional phase shift via adiabatic evolution of dark eigenstates: a new approach to quantum computation.
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DOI：
10.1103/physrevlett.95.080502
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发表时间：
2005-08
影响因子：
8.6
通讯作者：
Shi-Biao Zheng
中科院分区：
文献类型：
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作者：
Shi-Biao Zheng
我们提出了一种通过绝热演化来实现量子相门的新方法。条件相移既不是动力源，也不是几何源。它源于暗态本身的绝热演化。这种量子逻辑门利用绝热通道，对实验参数的适度波动具有鲁棒性。与几何相门相比，不需要驱动系统进行期望的循环演化以获得期望的立体角。从而简化了程序，避免了获得所需立体角的误差，进一步提高了保真度。我们举例说明了这种量子逻辑门在离子阱系统中的应用。该思想也可以在其他系统中实现，为量子信息处理开辟了新的视角。
We propose a new approach to quantum phase gates via the adiabatic evolution. The conditional phase shift is neither of dynamical nor geometric origin. It arises from the adiabatic evolution of the dark state itself. Taking advantage of the adiabatic passage, this kind of quantum logic gates is robust against moderate fluctuations of experimental parameters. In comparison with the geometric phase gates, it is unnecessary to drive the system to undergo a desired cyclic evolution to obtain a desired solid angle. Thus, the procedure is simplified, and the fidelity may be further improved since the errors in obtaining the required solid angle are avoided. We illustrate such a kind of quantum logic gates in the ion trap system. The idea can also be realized in other systems, opening a new perspective for quantum information processing.